Added Trapping mechanism to Ordinary Percolation * Trapping can applied to the Pc_invaded list after the fact by calling OrdinaryPercolation.evaluate_trapping() * Still not perfect.  Isolated trapped pores are not properly dealt with
Added Trapping mechanism to Ordinary Percolation
* Trapping can applied to the Pc_invaded list after the fact by calling OrdinaryPercolation.evaluate_trapping()
* Still not perfect.  Isolated trapped pores are not properly dealt with


Former-commit-id: e061da6cab5d33900a4eedf50177cd872735b6c1
Former-commit-id: dce6763ec0a12e21feafc40191453e72652c7611
amdouglas/OpenPNM,PMEAL/OpenPNM,stadelmanma/OpenPNM,TomTranter/OpenPNM,amdouglas/OpenPNM